The syntheses of the 12 isomeric hydroxybenzo [blfluoranthenes (hydroxy-BbF, 1-12) are described. 1-Hydroxy-BbF was prepared by treatment of l-ox0-1, 2, 3, 3a-tetrahydro-BbF (13) with Pd/C. 2-Hydroxy-BbF was synthesized by reduction of 13 with NaBH,, followed by dehydration, epoxidation, and treatment with PdIC. 3-Hydroxy-BbF was obtained by reduction of 13 with Zn (Hg) followed by oxidation with Triton-B, dehydration, epoxidation, ...